• Option --xorg runs from console without additional setup.
• To run a second core Xorg server from within an already running X session, you have two possibilities:
  • Run x11docker as root, or
  • Edit or create file /etc/X11/Xwrapper.config and replace line:

allowed_users=console

with lines:

allowed_users=anybody
needs_root_rights=yes

On Debian and its derivates like Ubuntu and Mint you need to install package xserver-xorg-legacy. Depending on your hardware and system setup, you may not need line needs_root_rights=yes.

Without this configuration you might get an error message like:

(EE) xf86OpenConsole: Cannot open virtual console 8 (Permission denied)